According to the report, SoftBank is expected to approach Deutsche Telekom, the owner of T-Mobile as soon as Tuesday to discuss ending the merger talks. They had been in the process of finalizing details to merge the U.S.’s third and fourth-largest telecom carriers. (TechCrunch is owned by competing Verizon.)

The two had been in negotiations for months. Yet SoftBank’s board was said to have concerns about whether it would retain control after what could have been an all-stock deal in favor of Deutsche Telekom.

According to the report, “the German parent had insisted on a controlling stake, according to a source familiar with the situation. Some at SoftBank were initially amenable as long as the Japanese company retained some influence. But SoftBank’s board discussed at a meeting Friday that the company would not give up control.”